Inspections And Corrective Actions - Baltimore Aircoil Company Trillium Series Operating And Maintenance Instructions Manual

Inspections and corrective actions

GENERAL CONDITION OF THE EQUIPMENT
Once a year the general condition of the equipment should be inspected.
The inspection should focus on:
• Signs of corrosion
• Accumulation of dirt and debris
If there are any signs of blemishes or corrosion, the affected area should be thoroughly wire brushed and re-coated.
The recommended procedure is to use a base coat of ZRC (Zinc Rich Compound). The ZRC is available from your
local BAC-Balticare representative.
ADIABATIC PRE-COOLING MEDIA
About Adiabatic Pre-Cooling
Airborne debris is caught in the adiabatic pre-cooling media. They act as an air filter and as such protect the heat
exchanger coil from rapid and excessive fouling. During adiabatic operation the media is 'rinsed' by water
overfeed. The debris, that is rinsed from the media, will drain together with the excess water.
The pre-cooling media can be removed during cold seasons, as soon as it is guaranteed that the ambient
temperature will no longer exceed the dry-to-adiabatic switch point. This will extend the service lifetime of the
media. It will however increase the speed of fouling of the dry heat exchanger coil.
At least every quarter an inspection of the adiabatic pre-cooler media is recommended, also during mid-season and
winter season when usually no adiabatic cycles would be needed.
The inspection should focus on:
• Signs of excessive fouling and scaling of the media
• Full and even wetting of the face area
Fouling
If excessive dirt and debris has accumulated on the pre-cooling media, it is recommended to rinse the media.
Refer to "Adiabatic pre-cooling media" on page 27 for the recommended procedure for cleaning and rinsing of the
media.
Scaling
Scaling will deposit on the pre-cooling media, every time that the pre-cooling media dries at the end of each
adiabatic cycle. The rate of scaling will depend upon:
• The number of adiabatic starts and stops per day
• The water quality
• The water flow over the adiabatic pre-cooler
The expected service lifetime of the pre-cooling media is 5 to 7 years if basic housekeeping practices and these
operating and maintenance guidelines are followed.
If excessive scaling is accumulating too fast on the pre-cooling media, the following checks and adjustments need
to be made:
• Check and adjust number of adiabatic starts and stops:
refer to "Checks and adjustments" on page 17, section "Adiabatic Controller Set-Point".
• Check and adjust water quality:
refer to section "About water care" on page 8
• Check and adjust water flow distributed over Adiabatic Pre-Cooler:
refer to section "About water care" on page 8.
6 Maintenance procedure
6 Maintenance procedure
W W W . B A L T I M O R E A I R C O I L . E U
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